Just received a similar message Ubuntu 16.04 using YAD (Yet Another Dialog):
(yad:8401): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed ^^^ Appears about 20 times. I was in the process of adding new columns of icons to existing dialog box matching mime file types. Not sure exactly which code revisions caused the error though. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1582496 Title: GLib-GObject-CRITICAL failures during Ubuntu 16.04 bootup To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-session/+bug/1582496/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs